Algae - Euglena Gracilis - Flagellate
The Euglenophyta or euglenoids are 800 species of unicellular, protozoan-like algae, most of which occur in fresh waters. The euglenoids lack a true cell wall, and are bounded by a proteinaceous cell covering known as a pellicle. Euglenophytes have one to three flagellae for locomotion, and they store carbohydrate reserves as paramylon. The primary photosynthetic pigments of euglenophytes are chlorophylls a and b, while their accessory pigments are carotenoids and xanthophylls.
Most euglenoids have chloroplasts, and are photosynthetic. Some species, however, are heterotrophic, and feed on organic material suspended in the water. Even the photosynthetic species, however, are capable of surviving for some time if kept in the dark, as long as they are "fed" with suitable organic materials.
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